I recently sold 10 cases of oil sample kits on this site, but there were several more people who wanted them. I have 27 kits left that I had saved for myself, but I have sold my boat and don't need them. I will sell these pre-paid kits for $6 each or $50 for a case of 10 plus mailing. efn1 at cfl.rr.com 386-446-4242, cell 386-503-3231